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1985 Moon JJ-4 Vintage Jazz Bass Guitar Pearl White w/ EMG J Set, Japan


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Up for sale, a 1985 Moon JJ-4 Jazz Bass in exceptional condition and in perfect working order. A boutique Japanese brand rarely seen outside its country of origin, this expertly crafted Moon bass draws inspiration from the classic Fender J Bass platform, sporting an ash body, one-piece maple neck, slab ebony fretboard, EMG J Set pickups, and an active preamp.

The tone is well-balanced across all notes and strings, with sweeping harmonic overtones, ample punch, and quiet operation. This pickup set has classic Jazz Bass characteristics with a broader tonal frequency range for additional dimension and clarity. EMG's pickup design has a very low ratio of resistance to inductance, which increases the low end response, while the radiused ceramic bar magnet ensures a tight midrange punch with dynamic high end response. The bass weighs a robust 9lbs 11oz and sustains beautifully with the inherent rich midrange of ash and the glassy treble detail of the ebony fingerboard. We've had this Moon professionally setup here at Mike & Mike’s Guitar Bar with 45-105 roundwound strings, low action, and spot-on intonation.

The maple neck has a medium U shaped profile carve with round, inviting shoulders at the nut, filling out with more heft as you travel up the fretboard, measuring .860" deep at the 1st fret and .980" at the 12th. The slab ebony fretboard features pearloid dot inlay and stock medium jumbo fretwire. The frets have their full factory height with plenty of meat with virtually no wear, and the bass plays cleanly in all registers up the straight neck with a responsive, ideally adjusted truss rod. The scale length is a full 34”, and the nut is solid brass, with the slender and easily navigable 1 1/2" standard J Bass width. The matching headstock face features the original gold Moon waterslide decal and stock gold tuning machines, individually embossed with the Moon logo and featuring long stems and clover buttons.

The EMG J Set pickups are powered by a 9V battery in the control cavity, governed by a three knob complement, with individual Volume knobs, a Master Tone, and a three-way toggle pickup selector. The full size CTS pots date to 1985. The bridge is a top loader design, and gold hardware includes the quartet of knurled knobs, side jack, and Fender-style strap buttons. The gloss Pearl White finish is in impeccable shape, with uniform aging of the clear coat on the body, contrasting with the bright white headstock face. Cosmetic wear is limited to a couple small marks on the back edge of the treble side body horn and a few faint scuffs in the clear coat on the body as a whole. The neck profile sports a pristine smooth gloss finish.